I find this really hard to believe . OP typing in Caps is not going to make people believe you . Just curious what kind of car .
It's completely improbable. The weakest window on a car is the door window, and even then because it's made of heat treated tempered glass, it's still pretty freaking strong. [Thank 5yrs working in the glass industry for this knowledge]
Even without this knowledge, a quick search of YouTube on something such as "breaking car window" shows that it's not easy at all. There are videos are people throwing rocks, using hammers, and steel pipes on car windows with little to no effect.
They're made to NOT break during impact. This is why there are devices/tools specifically for breaking glass, and why a simple rock will not easily do the job.
Now if your window was already cracked severely or was made of non-safety class, then breaking it is possible. But at the same time, closing your car door could also make enough force to break non-safety glass.
Long story short, the OP can't post any proof what so ever, so we're led to believe he's made up this story for attention.